const CompressionWebpackPlugin = require('compression-webpack-plugin');
const path=require("path");
function resolve (dir) {
    return path.join(__dirname, dir)
}
module.exports = {
    productionSourceMap:false,
    //是否开启eslint保存检测,值为true|false|error
    lintOnSave:false,
    devServer:{
        port:3001,
        open:true,
        disableHostCheck: true,
    },
    chainWebpack: (config) => {
        config.resolve.alias
            .set('@', resolve('src'))
    },
    configureWebpack: ()=> {
        let obj={};
        if (process.env.NODE_ENV==="production") {
            obj.plugins=[new CompressionWebpackPlugin({
                algorithm: 'gzip',
                test: /\.js$|\.html$|\.css/, //匹配文件名
                threshold: 10240,//对超过10k的数据进行压缩
                minRatio: 0.8 //只有压缩率小于这个值的资源才会被处理。默认值是 0.8。
            })]
        }
        //不打包的库
        // obj.externals={
        //     vue: "Vue",
        //     vuex: "Vuex",
        //     "vue-router": "VueRouter",
        // };
        return obj;
    },
    css: {
        loaderOptions: {
            sass: {
                prependData: `
                    @import "@/assets/scss/theme.scss";
                `
            }
        }
    }
}